Yoga is amazing – even if you only practice for an hour each week you will experience the benefits of the practice. If you can manage to practice for an hour or so two or three times a week fantastic. You will certainly notice the difference. If you can only do 20 minutes per session, that’s fine too. Don’t let time constraints or unrealistic goals be an obstacle – do what you can and don’t worry about it. You will probably find that after a while your desire to practice expands naturally and you will find yourself doing more and more.